Battle of Midway, 1942-2017

Because they believed their own propaganda of invincibility.

One thing that I’ve never been able to understand about the Battle-of-Midway is why the Japanese weren’t more suspicious when their ‘surprise attack’ turned-out not to be such a surprise?

I mean, the Japanese plan was to attack Midway, and then when the US Navy carriers showed-up to defend Midway (as the Japanese thought they must), to ambush those US Navy carriers with their own carriers, sink them, and therefore dominate the Pacific Ocean unchallenged…

…so why didn’t the Japanese know it was a trap when the US carriers were already at Midway?